Inconsistent Changes from Version 2.3.0 to Version 2.4

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The changes to macros with variable numbers of arguments means that you'll have to declare macros with zero to one arguments as having 01 arguments; the old form (11) means between one and one arguments.

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Italic fonts are now not toggled off again by a second \it in TeX mode; rather you must use explicit grouping with {}.

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In callable SM, sm_window now expects 6 arguments, not 4.

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The macro is_set now does what it says; it doesn't do an implicit WHATIS. You probably want to use is_macro or is_vector rather than is_set.

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The command "set image(expr,expr) = expr" is now deprecated; please say "set image[expr,expr] = expr".

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The command to use ranges of windows is of the form "WINDOW 1 4 1 2:3", but for a while it was "WINDOW 1 4 1 2.3" (it was changed as "WINDOW 1 12 1 8.10" is indistinguishable from "WINDOW 1 12 1 8.1").

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